Volvo Penta 5.0Gi sitting for 10 years... Help!

mklearl

Petty Officer 1st Class
Joined
Apr 21, 2013
Messages
379
My father owns a 28 ft master marine with a 1998 volvo penta 5.0GI. 10 years ago while he was getting the boat ready for the summer season he suffered a debilitating stroke and was pretty much bed ridden for the remainder of his life. He passed away last month.

The boat has been sitting covered and winterized since then and I'm seriously considering buying the boat. At the very least I need to get her running before I can sell it. He was very careful with it and kept a log of all the work done. Last log was the winterization... changed the lube oil and filters, ran the engine with winter mix (marvel mystery oil, gas and fuel stabilizer). Ran antifreeze through the system. Those were his notes. So my question is, what do I need to do. I'm not going to do anything until this spring but I want to get all my ducks in a row and don't want to do anything to damage the engine... which quite frankly I don't know anything about. I don't think the fuel tank was full (or hope not... 150 gallons) but highly doubt it was bone dry which means the gas is sludge and tank probably needs to be cleaned... any advise on that would also be helpful. What else should I do/ look for?

When the boat was stored at a friends house he was really concerned that someone would try to start it... no one did but I can't understand why he would have a problem if they did. He ran the engine with the winter mix already to winterize it and nothing in the fuel would cause harm. I believe that it is fresh water cooled so when he was referring to running antifreeze through the system he was talking about through the freshwater cooling system as well as sucking it up into the raw water intake on the outdrive. I again don't see a problem that would occur with this other than the fact that if it was ran too long it would de winterize. Again... I am new to these engines and just looking to fill in the blanks. Any help is appreciated. Thanks in advance!
 

Pesimist

Seaman
Joined
Jul 6, 2012
Messages
65
The good thing is ethanol gas wasn't as widely used back then. Might be as easy as draining the fuel, putting on a new impeller, and new drive bellows.
 

mklearl

Petty Officer 1st Class
Joined
Apr 21, 2013
Messages
379
Unfortunately I think it was ethanol used. I remember him talking about his buddy having a problem caused by ethanol and he was glad he didn't have any problems. Drive Elbows? I pretty much figured all seals are junk and anything else rubber.
 

dypcdiver

Lieutenant Junior Grade
Joined
Nov 1, 2005
Messages
1,043
If the boat was used in salt water then I would be very wary of the manifolds, and cost them into the de-winterizing.
No need to change the bellows until you have the engine running on muffs, but should be done before launching. (outdrive in the lowered position)
New impeller is essential or bits of it will end up blocking the cooling system.

Check the fuel level, it might be low and just adding new fuel might dilute it enough. Have a new fuel filter to hand when you try to start it, if she starts, run for a while and then change the filter. (I have recently started a 4hp outboard after 25 years with original fuel!)

Other thing to check is the distributer cap, as my 5.0 Gi has a habit of growing green mould on the internal contacts after only 6 months lay up.
Have fun.
 

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,620
I would pull the distributor and run the oil pump with a drill/adapter. Normally I would rotate the engine by hand after pulling the plugs but that may be hard due to the water pump if it's on the crank. If you have the belt driven one, then I would squirt some oil in the cylinders and rotate it.

Run the engine on a portable tank until you get the main tank figured out.
 
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